Hi trev from trev.
Is there really a trev about under 40?!
The main market for cars in the UK was traditionally 4 door saloons as typified by the Ford Cortina. This contrasted with the continent, where smaller cars were the predominant seller. This was because for many years here there were more "company cars" than private, and the saloon formed the backbone of the fleets. It was a very tax efficient "perk" and formed part of the salary for many (at 19 I worked in the sales office of a steel stockholder where everyone had a company car - including I).
As the tax advantage has diminished, and the "company car" now only provided for reps, middle and upper management (and often a cash alternative is provided), smaller hatchbacks have become predominant. For at least 10 years (probably longer), the biggest volume sellers have been Golf/Focus size hatches. The 4 door saloon has been usurped totally.
The niche markets have proliferated over the years. There have always been sports cars, but whereas 4WD was almost solely for utility vehicles 3 decades ago, now the explosion in domesticated "SUV"s is evident to see.
Another niche, which has become almost mainstram is the "hot hatch". The hatchback has become an ever more popular configuration, owing to it's practicality, since it's emergence in the early 70s (Alfasud, I believe, was the pioneer). In 77 VW introduced the Golf GTi, a performance version of their standard hatch, providing the cobination of sports car performance and handling with the practicality of a hatchback. The format has been a collosal success, copied by every manufacturer, with performance versions of almost every standard hatch being big sellers.
Regarding breakdowns, I wouldn't know. Cars are generally far more reliable these days, and I would guess electrics are the most predominant cause of incidents. The RAC and AA are kept busy rescuing folk who have put diesel in their petrol car, and vice versa. Maybe that's the biggest cause of breakdown.
It would certainly be a good idea if people took a basic kit in case of emergency - though I don't, I admit. It is law in many continental countries that all cars carry a first aid box and a warning triangle.
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35% constitutes neither a majority nor a mandate